The Centre for Health Protection found 21 Sha Tin kindergarten pupils with upper respiratory tract infection symptoms since October 9.

The children, nine boys and 12 girls, all aged three, developed fever, cough, runny noses and sore throats. Four of them were admitted to hospitals while 17 of them sought medical attention from private doctors or public clinics. Three of those who were hospitalised have been sent home, while one remains in hospital in stable condition.

The centre has conducted field visits to the school which is  under close watch.

It urges the public and management of institutions to take preventive measures against respiratory tract infections by observing strict environmental and personal hygiene.

More information on the disease is available here.